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通过末端淬火试验研究了亚晶界对Al-7.01Zn-1.26Mg-1.43Cu合金淬火过程中的淬透性和第二相析出行为的影响。两组试样分别在440°C和480°C温度下固溶处理,以获得不同的再结晶分数。结果表明,亚晶界能够增大合金最大硬度值,但会明显降低淬透层深度。由于亚晶界的增加而引起的表面能的变化降低了相变激活能,故能够促进η′相的形成及向η相的转变。
The effect of subgrain boundaries on the hardenability and the precipitation behavior of the second phase during quenching of Al-7.01Zn-1.26Mg-1.43Cu alloy was studied by the end quenching test. Two sets of specimens were solution treated at 440 ° C and 480 ° C, respectively, to obtain different recrystallization fractions. The results show that the subgrain boundaries can increase the maximum hardness of the alloy, but will significantly reduce the depth of quench layer. The change of the surface energy due to the increase of the subgrain decreases the phase change activation energy, so it is possible to promote the formation of the η ’phase and the transition to the η phase.